Specs are:
Intel E8400
Palit HD4850 512MB
4GB generic RAM
Asus P5QL-E
Benq LCD monitor
Windows 7 64bit
Corsair HX520W power supply

The computer's working fine since Jan last year. Today I booted it up and it wouldn't register any keystrokes on my keyboard. So, I restarted the pc and I get a blank screen.

The pc is running fine in the background, its just that I don't get any video output at all. I tried both DVI ports, removed and reattached power cords, removed and put back the graphic card. Nothing seems to work.

Even tried connecting to my TV via a DVI-to-VGA adapter.

I got video out working one or two times when doing all of this. But it goes away as soon as I restart.

Someone please help.